Asteroids

2005WY55 help

Last update: 2026-07-30 11:21 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.701

Aphelion (Q)

4.286

Eccentricity (e)

0.719

Inclination (i)

7.3

deg

Orbit period (P)

1438.1

Earth MOID

0.00248

U parameter

0.9

Next Earth close approach

Date

2061-06-06

Nominal distance (from Earth center)

0.14263

21336863

Maximum Brightness

19.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.7

mag

Diameter

190 - 400*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2005-11-26

Observatory

University of Arizona Mt. Lemmon Survey

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.493407

1-sigma variation

5.304E-8

Unit

Eccentricity (e)

Value

0.718753

1-sigma variation

2.131E-7

Unit

Inclination (i)

Value

7.2731

1-sigma variation

3.093E-5

Unit

Long. of Ascending Node (Ω)

Value

247.9398

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

286.4101

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

62.25409

1-sigma variation

0.00007

Unit

Perihelion distance

Value

0.701264

1-sigma variation

Unit

Aphelion distance

Value

4.285550

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.011340

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.525092

1-sigma variation

Unit

MOID

Value

0.002480

1-sigma variation

Unit

Orbit Period

Value

1438.0970

1-sigma variation

Unit

U parameter

Value

0.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.81321E-15	4.04322E-15	1.11378E-13	2.73666E-15	9.84241E-13	-3.36836E-12
e	4.04322E-15	4.54131E-14	3.60936E-12	1.86817E-12	1.13837E-11	-1.53161E-12
i	1.11378E-13	3.60936E-12	9.56690E-10	1.17153E-9	-1.31666E-11	7.18836E-11
Ω	2.73666E-15	1.86817E-12	1.17153E-9	2.86001E-9	-2.25328E-9	5.35001E-11
ω	9.84241E-13	1.13837E-11	-1.31666E-11	-2.25328E-9	5.62988E-9	-2.60929E-10
M	-3.36836E-12	-1.53161E-12	7.18836E-11	5.35001E-11	-2.60929E-10	4.32577E-9

Date of computation: 2026-07-30 11:21 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.692

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

190 - 400*

Unit

Source

[2]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

1451

Unit

Source

[1]

Unobserved

Value

6130

Unit

Source

[1]

Normalized RMS of residuals

Value

0.635248

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2005-11-26.35601

Unit

Source

[2]

Last Observation

Value

2009-11-16.51324

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

138 (3)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

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Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2005WY55 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1959-05-27 05:53	1.0	0.0741854	0.0741645	0.0000070
EARTH	1998-06-08 22:39	< 1 min	0.1153685	0.1153617	0.0000023
EARTH	2006-01-13 06:36	< 1 min	0.1577592	0.1577579	0.0000004
EARTH	2061-06-06 11:07	< 1 min	0.1426281	0.1426054	0.0000076
EARTH	2065-05-28 01:11	< 1 min	0.0022232	0.0022037	0.0000065
EARTH	2069-01-13 16:14	280.5	0.1368481	0.1325422	0.0014452
MARS	2100-01-08 03:16	1034.6	0.0390918	0.0379598	0.0031400
EARTH	2100-05-21 21:26	> 1 d	0.0327520	0.0052874	0.0153053
EARTH	2108-01-03 19:28	> 1 d	0.1650858	0.1186145	0.0174391

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
34.31238011	144.07866934	0.00248005	MINIMUM
326.78916433	356.98584154	0.07008032	MINIMUM
0.40374360	69.79259993	0.31010472	SADDLE
1.10177822	251.50206264	1.70378401	SADDLE
180.12878117	250.33317323	3.28956423	SADDLE
180.24829999	70.37954561	5.27398723	MAXIMUM

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MOID Plots

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